Steam-turbine.



is, either to the stator or rotor,

The base 1, which may be either JAMES WlLSUN, OF MILWAUKEE, \VISCONSIN,

MILNVAUKE E, WISCONSIN, A CORPO- CHALlilltllS COEIPi-XNY, OF ltli'liQllOll NEW JERSEY,

ASSIGNOR TO ALLIS- STEAM-TURBINE.-

Specification of Letters Patent.

Application filed April 16,1906- Serial No. 31;l,831.

To whom it Jim/y concern:

it known that l, JAMEE WILSON, a sub ject of the King ol" Great Britain, residing at ldilwarukee, in the county oi idilwankee and State of Vtisconsin, have invented certain new and useful improvements in Steam-Turbines, of which the following is a specification.

The invention relates to steam-turbines, and has for its obiect the fastening of blades to a base, either cylinder as the case may be.

In the drawings, Figure 1 is a broken View of a blade-fastening looking longitudinally of the blade, the blade being in section on the line l'l ol' Fig. -l. Fig. 2; a similar View, the blade being insccl ion onthe line ll ll, Fig. 4. Fig.3 is a similar View ol the notched holdingstrip. Fig. 4-

a broken. sectional View of blade l'aslen-inc; means, the section being taken on the line lfV [V of Fig. 2. Figs. 5,6, and 7 are three views, on a reduced scale, ol' the spzu'ing-block.

llrl'orring to thr-v drawings, Figs. 1 to l, in cl usivo, are shown on agreatly-enlarged scale. the stator or rotor, has undercut grooves into which the blades 2 are fastened by the holding in mus. Generally speaking, this holding means consists oi' a notched iu'ildingstrip 3, the notches 4.- being cut therein at an angle to one ol'flits sides. The root :3 ol the blade .2 being inserted into the notch 4, ol the holding-strip 3,. the latter is then. placed'in pos tion in the groove ot the base, and spacing-blocks 6 are thercal'ter inserted botweenthe roots oi" the blades, the holding-strip 3, and the remaining wall ol' the groove in the base. These spacing-blocks are then calkcd so that they will llow into the undercut portions of the groove in the base and any other l'ree space where the metal may llow.

In the fastening means as illustrated. in the drawings the holding-strip 3 is shown as projecting considerably beyond the base 1.

This projection is desirable in cases where balilitw-strips are fastened to the ends of the rings of blades, the projection being approximately equal in length to the extent of the ballling-strip beyond the ends of the blades. The liol lingstrip need not necessarily, how-- ever, project beyond the l ar-1v, and the projection is n t used when an bnlllingslri s or spindle-that l chamfercd oil at an angle.

blocks is tapered along its are not necessary. The :holding-strip is shown tapered at the side coming with the wall of the-groove in the base. This wall of the base/groove is correspondingly hndercut. In using the terrn'lundercutits meaning is intended to refer to any p'arthavirig any portion within the portion which extends into the groove a maximum ing a less distance into the groove. a

. The opposite side of the holdin strip 3 is without any taper and coacts with the straight face 61 of the spacing-block 6.

The blades 2 have roots formed. by stamping or swaging. These roots are angular in cross-section and, generally speaking, resem-' ble two wedges placed back to back. The plane in which these two wedges meet lies in the plane between the holdingstri'p 3 an the s acing-blocks 6 when the parts are assemb ed. The roots extend in the general direction of the blade, so as to avoid any great I disturbance of metal 'in shaping the. roots.

iar way. into the notches t of the hohiirig-stripB is tapered at its ide edge 21. l l hat portion of the roots which extends between two spacingfsi de faces 22 23, as well as its side edge 24. i The end 41ml the notch 41 is undercut; so as to coact, with the tapered edge 21 of the blade-root. The sides 62 63 of the spacing-block 6 are undercut to enact with the tapered side faces 22 23, respcctivcl y, of the blade-root.

Spacing-l'dock 6 is originally two of its sides 61 64 parallel.

formed with The sides 62 63 are undercut, as justindwated. The top" 65 of the spacing-block is preferably formed square, so as to be parallel withthe bottom 66; but this is not ,essential. After being calked the block 6 assumes the shape shown in Figs. 1, l, and 4. Here its top has become A projection 67 has been formed thereon by t allowing of the metal into a groove the holding-strip 3. The side 64 has'become tapcredl'iy the low-of the metal so as to coact with the undercut wall 11 of the groove in. the base i, and the metal of the block 6 has flowed s'o as tdfo'rni enundercut wall 624 on the one block and a corre n undercut wall on the adpwent spondi a block. This wall 624 and its adjacent un- .lhat wedge portion which extends formed in the side of 'f the faces 63 Patented Oct. 30, 1906. r

distance, extenddereut Wall coact with the tapered side edge of the blades may be changed, as the angle of 24 of the blade -'root. A projection and the notches in the holdin -strip and the angle of the side faces 62 63 the spacing-blocks o miiy be made the variable quantities.

This would prevent displacement of the block 6 relative to the strip 3 in a direction longitudinally of the holding-strip 3.

Instead of the notches 4 in the strip 3 be- 10 ing undercut at their ends the may beundereut along their sides and t e blade-root correspondingl tapered. Also the spacingbloeks 6 may e formed with straight sides .62 63 instead of being undercut and so formr 5 ing them as to be undercut and coa'et with the tapered edge 24 of the blade-root. In this case calking would only be necessary to cause the metal to How under the side of the groove in the base and, if so constructed, into the notch in the holding-strip 3. A separate having undercut notches, blades in the ealkin' -strip ma be necessary. The block notches, and blocks in the groove eoaeting .may 0 )viously a so be formed so as to fit the with the strip and blades and having an un lade-roets entirely without any ealking and dercut portion. 70 with straight sides 64, except, possibly, for 4. A grooved base, a notched strip in the locking-ribs and grooves therein, as at 67, groove, blades in the notches, and blocks in Fig. 4. A. separate oalking-strip may then the groove eoaetin with the strip and blades be inserted between the sides 64 of the spaeand having an und ercut portion. ing-bloek 6 and the wall of the grooves in the 5. A grooved base, a stri in the groove 75 base l-such, for instance, as is described in havingnotohes undercut at their ends, blades the patent to Earth, No. 816,207, March 27, in the notches eoaeting along an edge with 1906. The side of the groove in the base 1, the undercut notch ends, and blocks in the which would then coact with the calking groove, said blocks having an undercut porstrip, would not necessarily have to be untion eoaeting with the side of the blade. 80

ereut, but might partake of the form of a 6. A base, a blade tapered across its thick- 5. straight side havingagroove, as shown in the ness at one ortion of the blade-root and said patent. across its width at a second portion of the he invention is equally applicable to rablade-root, and means for fastening the blade dial or arallel flow turbines. to the base, eo-mprisin an element coaeting 85 It wi be seen that by this invention aceuwith the first portion 0; the blade-root and a rate spacing of the blades is insured; the separate element eoaeting with the second b ading material is disturbed to a minimum portion of the blade-root. at the root of the blade, narrow grooves are In testimony whereof I affix my signature enabled to be used in the base, thus miniin presence of two witnesses.

skilled in the art.

It is claimed and desired to secure by Letters Patent- 1. A ooved base,'a notched strip in the groove, lades in the notches, and b oeks in 60 the groove eoacting with the strip and blades.

2. A grooved base, a strip in the groove having undercut notches, blades in the notches, and blocks in the groove coaeting with the strip and blades. 5

3. A grooved base, a strip in the groove mizing amount of holding material; the JAMES WILSON. blades are tapered along their width, as well Witnesses:

as along their thickness; a uniform shape of G. F. Die l/VEIN,

blade-roots may be used, although the angle Jon-N DAY, Jr. 

